×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Low cycle fatigue/Direct Cycling: Input and Output

Low cycle fatigue/Direct Cycling: Input and Output

Low cycle fatigue/Direct Cycling: Input and Output

(OP)
Hi,
I would like to ask for some advices on Direct Cycling.
First, defining the sinusoidal load. I define it in 3 places: (a) as Cycle Time Period in Step, (b) in Amptitude (Circular frequency and Initial amplitude, A and B), and (c) in Load (Magnitude). Somehow, Lets say, I have a sinusoidal load, starting at zero, duration of each loading cycle 0.5 s, totally 100 cycles, total duration 50sec, Maximal Load (peak) 100 N, lowest load zero. Should I set: Cycle Time Period 0.5, Initial Amplitude 0, A=1, B=0, Circular frequency =2*pi/0.5, Magnitude 100 ? And if the lowest load is 30, I set Initial Amplitude 30?

About output: Can I see the stresses/damage in different cycles? Now, I see in Step/Frame 3 increments (Step Time 1 and 501). Can I see it per Cycle?

And can I estimate stiffness reduction as a function of cycles? Apparently, I need to determine Reaction Force for each cycle – but how to make them to be printed out after each cycle? Can I get like S-N curve from direct cycling simulations – if yes, how?

Leon

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources